On Mon, 02 May 2005 07:46:31 -0600, Shane Hathaway <[EMAIL PROTECTED]> wrote:
>Anders J. Munch wrote:
>> in opening('file1') as f1:
>> ...
>> in opening('file2') as f2:
>> ...
>> except IOError:
>> print "file1 not available, I'll try again later"
>>
>> I rather like this version, because it is patently clear what should
>> happen if there is no except-clause: The exception propagates
>> normally.
>
>My eyes would expect the exception handler to also catch IOErrors
>generated inside the block statement body. My eyes would be deceiving
>me, of course, but Python isn't currently so subtle and it probably
>shouldn't be.
>
>You could also do this with a suitable iterator.
>
> def opening_or_skipping(fn):
> try:
> f = open(fn)
> except IOError:
> print "file1 not available, I'll try again later"
> else:
> try:
> yield f
> finally:
> f.close()
I don't think this version is really of much use. It requires that you
implement a different iterator for each kind of error handling you want to do.
Avoiding multiple different implementations is supposed to be one of the main
selling points of this feature.
Jp
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